Stainless Welded Steel Pipe : 304 / 304L ,316 / 316L
Stainless steel welded pipes are made from stainless steel sheets or strips that are rolled into the desired shape, welded along the seam, and then cut to the desired length. These pipes are used in various industries due to their corrosion resistance, high strength, and durability. Stainless welded steel pipes are available in different grades, sizes, and thicknesses, depending on the specific requirements of the application.
Applications:
Stainless steel welded pipes are used in a wide range of applications, including:
- Construction: They are used in structural applications, such as building frames, handrails, and support structures.
- Oil and gas: Stainless steel pipes are used in the oil and gas industry due to their corrosion resistance and ability to withstand high pressures.
- Chemical and petrochemical: These pipes are used in chemical and petrochemical plants for transporting corrosive fluids and gases.
- Food and beverage: Stainless steel pipes are commonly used in the food and beverage industry due to their hygienic properties and resistance to corrosion caused by acidic or alkaline substances.
- Water treatment: Stainless steel pipes are used in water treatment facilities for transporting water and wastewater.
- Automotive: These pipes are used in various automotive components, such as exhaust systems, fuel lines, and hydraulic systems.
- Pharmaceutical: Stainless steel pipes are used in pharmaceutical manufacturing plants for transporting chemicals and fluids.
Advantages:
- Corrosion resistance: Stainless steel has a chromium content of at least 10.5%, which forms a protective layer of chromium oxide on the surface, providing excellent resistance to rust and corrosion.
- High strength: Stainless steel welded pipes can withstand high pressures and mechanical stress, making them suitable for various applications.
- Durability: Stainless steel is resistant to wear, making the pipes long-lasting and cost-effective.
- Hygienic properties: The smooth surface of stainless steel pipes prevents the buildup of bacteria and other contaminants, making them suitable for food, beverage, and pharmaceutical applications.
- Aesthetics: Stainless steel pipes have a sleek and modern appearance, making them an attractive choice for architectural and design applications.
When selecting stainless steel welded pipes, consider factors such as the type of application, required corrosion resistance, mechanical properties, and budget, to ensure you choose the appropriate grade and specifications for your project.
There are several grades of stainless steel used for welded pipes, depending on the application and required properties. The most common grades can be divided into three main categories: austenitic, ferritic, and duplex stainless steel. Here are some of the popular grades in each category:
Austenitic Stainless Steel:
Austenitic stainless steel is the most widely used type of stainless steel due to its excellent corrosion resistance, formability, and weldability. Common austenitic grades for welded pipes include:
- 304 / 304L: This is one of the most frequently used stainless steel grades for welded pipes. It offers good corrosion resistance and is suitable for various applications, including food and beverage, pharmaceutical, and water treatment.
- 316 / 316L: This grade has an increased molybdenum content, providing better corrosion resistance in chloride environments than 304. It is commonly used in marine and chemical processing applications.
- 321: This grade contains titanium, which stabilizes it against intergranular corrosion caused by chromium carbide precipitation. It is often used in high-temperature applications.
Ferritic Stainless Steel:
Ferritic stainless steel has lower corrosion resistance than austenitic stainless steel but offers good strength and is more cost-effective. Some common ferritic grades for welded pipes include:
- 409: This is a low-cost, low-chromium ferritic stainless steel commonly used in automotive exhaust systems due to its resistance to high temperatures and corrosion.
- 430: This grade has higher chromium content than 409, providing better corrosion resistance. It is used in applications like architectural trim, appliances, and automotive components.
Duplex Stainless Steel:
Duplex stainless steel combines the properties of both austenitic and ferritic stainless steel, resulting in a material with high strength and good corrosion resistance. Some common duplex grades for welded pipes include:
- 2205: This is a popular duplex stainless steel grade, offering good corrosion resistance, high strength, and excellent resistance to stress corrosion cracking. It is commonly used in chemical processing, oil and gas, and marine applications.
- 2507: This is a super duplex stainless steel with higher chromium, molybdenum, and nitrogen content, providing increased corrosion resistance and strength. It is used in applications like desalination plants, chemical processing, and offshore platforms.
These are just some of the many stainless steel grades available for welded pipes. Selecting the appropriate grade depends on factors such as the specific application, required corrosion resistance, mechanical properties, and cost considerations.
Available Welded Stainless Steel Pipe Grades
| Product Name | Executive Standard | Dimension | Steel Code / Steel Grade |
| Industrial Pipes | ASTM A312, A358, A778, JIS G3459 | OD: 1/4″~40″ | TP304, TP304L, TP316L, SUS304TP |
| WT: SCH5S~SCH80S | |||
| Tubes for Boiler and Heat-Exchanger, General Service Tubing | ASTM A249, A269, JIS G3463 | OD: 15.9~139.8mm | TP304, TP304L, TP316L, SUS304TB |
| WT: 1.6~5.0mm | |||
| Mechanical and Structural Tubes | ASTM A554, JIS G3446 | OD: 7.9~152.4mm | MT304, MT304L, MT316L, MT430 Grade 201, 202 as per mill’s STD SUS304 |
| WT: 0.5~6.5mm | |||
| Square Tubes | ASTM A554 | OD: 12.7×12.7~150x150mm | MT304, MT304L, MT316L, MT430 Grade 201, 202 as per mill’s STD |
| WT: 0.7~6.5mm | |||
| Rectangular Tubes | ASTM A554 | OD: 10×20~100x200mm | MT304, MT304L, MT316L, MT430 Grade 201, 202 as per mill’s STD |
| WT: 0.7~6.5mm | |||
| Sanitary Tubing | ASTM A270 | OD: 25.4~165.2mm | TP304, TP304L, TP316L, SUS304TBS |
| JIS G3447 | WT: 0.8~3.05mm | ||
| Large Gauge Pipes for Ordinary Piping | JIS G3448 | OD: 15.88~318.5mm | SUS304TPD |
| WT: 0.8~3.0mm | |||
| Large Diameter Pipes | JIS G3468 | OD: 14″~40″ | SUS304TPY |
| WT: SCH5S~SCH40S |
| Nominal Diameter NPS | Outside Diameter (mm) | Nominal Wall Thickness (mm) | ||||||||
| ASME B36.19M | ASME B36.10M | |||||||||
| SCH 5S | SCH 10S | SCH 40S | SCH 80S | SCH 5 | SCH 10 | SCH 20 | STD | XS | ||
| 1/4 | 13.72 | — | 1.65 | 2.24 | 3.02 | 1.65 | — | 2.24 | 3.02 | |
| 3/8 | 17.15 | — | 1.65 | 2.31 | 3.2 | 1.65 | — | 2.31 | 3.2 | |
| 1/2 | 21.34 | 1.65 | 2.11 | 2.77 | 3.73 | 1.65 | 2.11 | — | 2.77 | 3.73 |
| 3/4 | 26.67 | 1.65 | 2.11 | 2.87 | 3.91 | 1.65 | 2.11 | — | 2.87 | 3.91 |
| 1 | 33.4 | 1.65 | 2.77 | 3.38 | 4.55 | 1.65 | 2.77 | — | 3.38 | 4.55 |
| 1 1/4 | 42.16 | 1.65 | 2.77 | 3.56 | 4.85 | 1.65 | 2.77 | — | 3.56 | 4.85 |
| 1 1/2 | 48.26 | 1.65 | 2.77 | 3.68 | 5.08 | 1.65 | 2.77 | — | 3.68 | 5.08 |
| 2 | 60.33 | 1.65 | 2.77 | 3.91 | 5.54 | 1.65 | 2.77 | — | 3.91 | 5.54 |
| 2 1/2 | 73.03 | 2.11 | 3.05 | 5.16 | 7.01 | 2.11 | 3.05 | — | 5.16 | 7.01 |
| 3 | 88.9 | 2.11 | 3.05 | 5.49 | 7.62 | 2.11 | 3.05 | — | 5.49 | 7.62 |
| 3 1/2 | 101.6 | 2.11 | 3.05 | 5.74 | 8.08 | 2.11 | 3.05 | — | 5.74 | 8.08 |
| 4 | 114.3 | 2.11 | 3.05 | 6.02 | 8.56 | 2.11 | 3.05 | — | 6.02 | 8.56 |
| 5 | 141.3 | 2.77 | 3.4 | 6.55 | 9.53 | 2.77 | 3.4 | — | 6.55 | 9.53 |
| 6 | 168.28 | 2.77 | 3.4 | 7.11 | 10.97 | 2.77 | 3.4 | — | 7.11 | 10.97 |
| 8 | 219.08 | 2.77 | 3.76 | 8.18 | 12.7 | 2.77 | 3.76 | 6.35 | 8.18 | 12.7 |
| 10 | 273.05 | 3.4 | 4.19 | 9.27 | 12.7 | 3.4 | 4.19 | 6.35 | 9.27 | 12.7 |
| 12 | 323.85 | 3.96 | 4.57 | 9.53 | 12.7 | 3.96 | 4.57 | 6.35 | 9.53 | 12.7 |
| 14 | 355.6 | 3.96 | 4.78 | 9.53 | 12.7 | 3.96 | 6.35 | 7.92 | 9.53 | 12.7 |
| 16 | 406.4 | 4.19 | 4.78 | 9.53 | 12.7 | 4.19 | 6.35 | 7.92 | 9.53 | 12.7 |
| 18 | 457.2 | 4.19 | 4.78 | 9.53 | 12.7 | 4.19 | 6.35 | 7.92 | 9.53 | 12.7 |
| 20 | 508 | 4.78 | 5.54 | 9.53 | 12.7 | 4.78 | 6.35 | 9.53 | 9.53 | 12.7 |
| 22 | 558.8 | 4.78 | 5.54 | 4.78 | 6.35 | 9.53 | 9.53 | 12.7 | ||
| 24 | 609.6 | 5.54 | 6.35 | 9.53 | 12.7 | 5.54 | 6.35 | 9.53 | 9.53 | 12.7 |
| 26 | 660.4 | — | — | — | — | — | 7.92 | 12.7 | 9.53 | 12.7 |
| 28 | 711.2 | — | — | — | — | — | 7.92 | 12.7 | 9.53 | 12.7 |
| 30 | 762 | 6.35 | 7.92 | — | 6.35 | — | 7.92 | 12.7 | 9.53 | 12.7 |
| 32 | 84 |
812.8 | 2133.60 |
Thinkness: 8.63-30mm | ||||||||
Welded Stainless Steel Pipe Test
Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test.
Mill Test Certificate: EN 10204 3.1 and EN 10204 3.2
Third party inspection: SGS, BV, Lloyds etc.
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